MAP electronics Cocerto-B Especificações descarregar pdf (Página 19)

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Usage Notes and Known Design Exceptions to Functional Specifications

Advisory Cortex-M3 Flash: C28x Reset While C28x Holding Pump Ownership Can Cause

Erroneous Cortex-M3 Flash Reads

Revision(s) Affected 0, A, B

Details If the C28x Subsystem is reset while it owns the flash pump semaphore, then the flash

pump itself will also reset. Since the flash pump is also used by the Cortex-M3

Subsystem, any instruction fetch or data read from flash by the Cortex-M3 will return

invalid data. This will result in a hard fault, incorrect program execution, Cortex-M3 core

hang condition, or an unspecified error in the application.

This erratum does not apply if the C28x Subsystem never writes to the

CPUMPREQUEST register to take ownership of the flash pump semaphore.

Workaround(s) The Cortex-M3 must not access flash while the C28x holds the flash pump semaphore

ownership. The following steps describe how this can be achieved:

1. At application start-up, the C28x reads the CPUMPREQUEST semaphore register. If

it is the owner, the C28x relinquishes the flash pump semaphore.

2. When the C28x wants to own the flash pump semaphore, it must notify the Cortex-

M3 and wait for an acknowledgement.

3. The Cortex-M3 application branches to RAM and notifies the C28x that it has done

so. Any data being accessed by the Cortex-M3 must also reside in RAM at this time.

4. The C28x takes ownership of the semaphore.

5. The Cortex-M3 will refrain from accessing the flash until the C28x releases ownership

of the flash pump semaphore.

Advisory SSI: SSI Microwire Frame Format is Not Supported on This Device

Revision(s) Affected 0, A, B

Details The Synchronous Serial Interface (SSI) module does not support the Microwire frame

format. SSI and SPI frame formats are not affected.

Workaround(s) None

SPRZ357J–August 2011–Revised July 2014 F28M35x Concerto™ MCU Silicon Errata

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MAP electronics Cocerto-B Especificações Página 19